/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jclouds.sqs.features;

import static com.google.common.base.Preconditions.checkNotNull;

import org.jclouds.sqs.domain.Message;

import com.google.common.base.Function;

/**
 * Utilities for {@link Message}s
 */
public class Messages {
   public static Function<Message, String> toReceiptHandle() {
      return ToReceiptHandleFunction.INSTANCE;
   }

   // enum singleton pattern
   private enum ToReceiptHandleFunction implements Function<Message, String> {
      INSTANCE;

      @Override
      public String apply(Message o) {
         return checkNotNull(o, "message").getReceiptHandle();
      }

      @Override
      public String toString() {
         return "toReceiptHandle";
      }
   }

}
